Stilobezzia (Stilobezzia) campinaranensis, Da Silva & Ferreira-Keppler & Cazorla, 2023

Da Silva, Irene M., Ferreira-Keppler, Ruth L. & Cazorla, Carla G., 2023, Stilobezzia Kieffer (Diptera: Ceratopogonidae) from the Brazilian Amazon: three new species, redescription of S. (Stilobezzia) maculata Lane and new records, Zootaxa 5249 (4), pp. 485-499 : 490-492

Stilobezzia (Stilobezzia) campinaranensis n. sp.

( Figs. 24–33 ; 50)

Type material. Holotype male ( INPA ) labeled: “Holotype Stilobezzia (Stilobezzia) campinaranensis Silva & Cazorla ”. BRAZIL, Amazonas , Manaus , Campina Biological Reserve, Campinarana, 02º58′94″ S – 60º03′07″ W, suspensa trap over stream, 13–27.vii.2018, I.M Da Silva and R. Ferreira-Keppler . Allotype female, same data as holotype, except: light trap over stream, 04.x.2018, I.M. Da Silva .

Paratypes. 2 males and 2 females, same data as holotype except: 23.viii–04.ix.2018: 1 male ( INPA ); 04– 18.ix.2018: 1 male, 1 female ( INPA ); 14–28.vi.2018: 1 female ( INPA ) .

Diagnosis. Only extant species of Stilobezzia (Stilobezzia) in the Neotropical Region dark and large (wing 1.36 mm long and 0.48 mm wide). Male: rod-shaped lightly sclerotized parameres, and aedeagus composed of two stout, hook-shaped sclerite. Female: sternite 8 quadrangular with a V-shaped posteromedian excavation and 3 pairs of setae; sternite 9 with folded inner margins, and two ovoid and sclerotized spermathecae measuring 80–50 µm and 60–40 µm, with narrow necks.

Description. Male. Head ( Fig. 24 ) dark brown. Antenna dark brown; flagellomeres 1-10 pale basally; 11–13 elongate, darker; 11–12 with basal stout setae; AR 0.71–0.80 (0.75; n=3). Palpus dark brown; segment 3 enlarged, stout, with stout setae and round sensory pit; segment 5 as long as segment 3; PR 2.20–2.78 (2.57; n=3). Thorax ( Fig. 24 ) dark brown; scutum with a poorly developed anteromedial rounded projection, posterior portion between wings slightly flattened; scutellum with 2 medial and 2 lateral setae. Legs brown; hind tibia with stout apical spine; tibial comb with 6 spines; tarsomeres pale brown; tarsomere 1 of foreleg with 3–4 stout apical spines; tarsomere 1 of hind leg with 1 very stout apical spine; prothoracic TR 2.03–2.12 (2.08; n=3); mesothoracic TR 2.25–2.53 (2.42; n=3); metathoracic TR 1.90 (1.87–1.93, n=3). Wing ( Fig. 27 ) hyaline; second radial cell 4x longer than first cubital fork beyond level of base of r-m cross-vein; length 1.22–1.50 mm (1.36 mm; n=2); width 0.40–0.56 mm (0.48 mm; n=2); CR 0.77–0.80 (0.78; n=2). Halter brown. Abdomen ( Fig. 24 ) with tergites 1-8 brown; dark spots on pleurae. Genitalia ( Figs. 29–30 ) brown; tergite 9 with rounded posterior margin, extending to apex of gonocoxites; cerci inconspicuous. Sternite 9 8X wider than long, with deep excavation. Gonocoxite 1,37X longer than wide, with broad mid-section. Gonostylus slightly curved distally, basally broader than long, with blunt apex. Parameres ( Fig. 31 ) subparallel, rod-shaped, lightly sclerotized, slender distally; basal portion narrow, broadest at mid-length with curved apices that overlap; basal apodemes sclerotized. Aedeagus ( Fig. 32 ) composed of two stout, hook-shaped sclerites.

Female. Similar to male with the following notable sexual differences: Head ( Fig. 25 ). Flagellomeres 9–13 darker; AR 1.10–1.16 (1.13; n=4). Palpus with stout segment 3; PR 1.85–2.45 (2.25; n=4). Mandible with 6–7 teeth. Thorax. Tarsomeres ( Fig. 26 ) slightly paler than tibiae and tarsi; claws as long as tarsomeres 5; basal tooth surpassing mid-length of the claws; prothoracic TR 2.08–2.21 (2.17; n=4), mesothoracic TR 2,40–2,66 (2,52; n=4), metathoracic TR 1.90–2.06 (1.98; n=4). Wing ( Fig. 28 ) with a few macrotrichiae at apex, on R 1 and R 3; length 1.38–1.56 mm (1.45 mm; n=4), width 0.50–0.54 mm (0.52 mm; n=4), CR 0.79–1.23 (0.91; n=4). Abdomen ( Figs. 25, 33 ). Sternite 8 quadrangular with V-shaped posteromedian excavation and 3 pairs of setae; sternite 9 with folded inner margins; sternite 10 with 1 pair of setae; cerci rounded, short. Two ovoid, sclerotized spermathecae with short necks, measuring 80–50 µm and 60–40 µm, plus, an ovoid rudimentary third spermatheca.

Distribution. Brazil (Manaus, Amazonas).

Etymology. The specific name campinaranesis refers to the site where this species was collected, in the Campinarana forest, Campina Biological Reserve.

Discussion. This new species resembles S. (S.) brasiliensis n. sp. (described above) by the anterior rounded projection of the scutum and its flattened posterior portion, and the 3–4 spines on the basitarsus of the foreleg. The parameres are similar to those of S. (S.) paulistensis Lane, 1947, but differing in the shape of the apical portion. The aedeagus resembles those of S. (S.) simplex Lane & Forattini, 1958 and S. (S.) transversa Lane & Forattini, 1958, except for their apical portion that are not hook-shaped.

Figures

FIGURES 24–33. Stilobezzia (Stilobezzia) campinaranensis n. sp., male 24, 27, 30–32; female 25–26, 28, 33; 24. Habitus, lateral view; 25. Habitus, lateral view; 26. Tarsi and claws, lateral view. 27–28. Wing; 29–30. Genitalia, ventral view; 31. Parameres, ventral view; 32. Aedeagus, ventral view; 33. Abdomen, ventral view.